Clinical Assessment and Diagnostic Classification of Psychological Disorders and Diagnostic Classification

Fundamentals of Clinical Assessment and Diagnosis

  • Clinical assessment is the systematic evaluation and measurement of psychological, biological, and social factors in an individual who may have a psychological disorder.
  • Diagnosis is the process of determining whether a person's symptoms meet the specific criteria for a psychological disorder, as defined in the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-55).
  • Assessment and diagnosis are essential for understanding the nature of psychological difficulties, studying psychopathology systematically, and developing appropriate treatment plans.
  • Assessment is often compared to a funnel:
    • Step 11 (Broad Gathering): The clinician collects information from many aspects of the person's life to identify possible problem sources.
    • Step 22 (Narrowing the Focus): The clinician rules out irrelevant possibilities and concentrates on areas most likely related to the person's difficulties.

Case Study: Frank — Anxiety and Intrusive Thoughts

  • Frank, a 2424-year-old mechanic, was referred for anxiety related to his marriage (99 months duration).
  • He reported feeling as though he was "coming apart" due to marital tension and stress at work.
  • Clinical Interview Strategy:
    • The therapist began with open-ended questions like, "What sorts of problems have been troubling you during the past month?"
    • This approach helps break the ice, allows the patient to describe concerns in their own words, and provides the clinician with the patient's perspective.
  • Nature of Anxiety:
    • Frank worried about losing his job, being unable to support his family, becoming seriously ill, and being criticized by his or his wife's parents (1717-year-old wife).
    • He reported difficulty concentrating and losing track of conversations.
  • Behavioral Observations:
    • Frank appeared very tense, avoided eye contact, and twitched his right leg.
    • He repeatedly closed his eyes tightly for 22–33 seconds, often coinciding with the leg twitch.
  • Hidden Intrusive Thoughts:
    • Further questioning revealed Frank experienced frightening, unwanted thoughts of having a seizure, falling, foaming at the mouth, or developing epilepsy.
    • To neutralize these thoughts, he would jerk his leg or pray intensely, which provided temporary relief.
    • Initially, Frank did not view these as the main problem and found them frightening to discuss; the clinician's observation of the eye-closing led to this discovery.
  • Preliminary Clinical Interpretation:
    • Frank's intellect was within normal limits and he was oriented times three (33), but his behavior suggested the presence of Obsessive-Compulsive Disorder (OCD).

Case Study: Brian — Suspicious Ideas and Ideas of Reference

  • Brian, a 2020-year-old recently discharged from the military, was referred for sexual problems.
  • He stated, "I'm a homosexual," yet reported no homosexual friends, partners, or past behaviors, and expressed a desire to be heterosexual.
  • Unusual Beliefs:
    • Brian believed people could tell he was gay just by looking at him and that they talked about him behind his back.
    • Ideas of Reference: He assumed that whenever people in another room were talking, they were specifically discussing him.
  • Interpretation:
    • Brian's belief about his sexuality was considered a delusion because it had no basis in reality and was held despite evidence to the contrary.
    • He also demonstrated homophobia, or strongly negative attitudes toward homosexuality.

Essential Qualities of Clinical Assessment

  • The usefulness of any assessment depends on three major qualities:
    • Reliability: The degree to which a measurement is consistent.
      • Interrater Reliability: The extent to which different clinicians reach the same conclusion using the same tool.
      • Test–Retest Reliability: The stability of an assessment over time (e.g., an IQ score should be similar on Tuesday and Thursday).
    • Validity: Whether an assessment actually measures what it is designed to measure.
      • Concurrent (Descriptive) Validity: Comparing a new assessment with an established one.
      • Predictive Validity: How well the assessment predicts future outcomes (e.g., an IQ test predicting school success).
    • Standardization: The process of establishing uniform standards or norms for administration, scoring, and interpretation.
      • Norms are developed by testing large groups varying in age, race, gender, and socioeconomic status.
      • A 1919-year-old African American individual should be compared with similar individuals rather than someone from a vastly different demographic.

The Clinical Interview and Mental Status Exam

  • The clinical interview is the core of clinical work, gathering data on current/past behaviors, attitudes, emotions, life history, and the history of the presenting problem.
  • Mental Status Exam: A systematic observation divided into five major areas:
    • 1. Appearance and Behavior: Includes overt behaviors (twitching), dress, posture, and facial expressions. Psychomotor retardation (slow movements) may indicate depression.
    • 2. Thought Processes:
      • Rate/Flow of Speech: Noted as fast, slow, or normal.
      • Continuity of Speech: Logical connection of ideas. Loose association (derailment) occurs when ideas are disconnected.
      • Content of Thought: Includes delusions (distorted beliefs, like persecution or grandeur), ideas of reference, and hallucinations (sensing things not present).
    • 3. Mood and Affect:
      • Mood: The predominant emotional state (e.g., depressed or elated).
      • Affect: The momentary emotional expression. Affect is "inappropriate" if it doesn't match the situation (laughing at tragedy) or "blunted/flat" if there is no expression.
    • 4. Intellectual Functioning: A general estimate of vocabulary, memory, and abstract thinking.
    • 5. Sensorium: General awareness of surroundings. A person is "oriented times three" if they know who they are, where they are, and the current date/time.

Interview Techniques and Confidentiality

  • Confidentiality (Privileged Communication): Information shared is protected and cannot be accessed without consent.
    • Exceptions: Imminent danger of harm to the patient or others.
  • Semistructured Interviews: Use carefully developed, standardized questions to ensure all symptoms are covered while allowing flexibility for follow-up.
    • Advantage: Improves consistency across clinicians.
    • Disadvantage: Can reduce the natural flow of conversation if used too rigidly.
    • Example: The Anxiety and Related Disorders Interview Schedule for DSM-55 (ADIS-55) specifically assesses obsessions and compulsions on scales of 00 (never) to 88 (constantly).

Physical and Behavioral Assessment

  • Physical Examination:
    • Recommended if no exam occurred in the past year to rule out medical mimics.
    • Hyperthyroidism can mimic anxiety; hypothyroidism can mimic depression.
    • Brain tumors can cause psychotic symptoms; cocaine withdrawal can cause panic attacks.
  • Behavioral Assessment: Formal observation of thoughts, feelings, and behaviors in specific contexts.
    • Target Behavior: The specific action causing difficulty.
    • The ABCs of Observation:
      • Antecedent: What happens before the behavior.
      • Behavior: The specific action.
      • Consequence: What happens after the behavior.
  • Analogue Assessment: Simulated or role-play situations (e.g., sitting a child with autism in a room alone to observe self-injury behavior).
  • Self-Monitoring: Patients record their own behaviors (e.g., smoking frequency or bulimic purging); often uses smartphones for convenience.
  • Reactivity: People change their behavior because they know they are being observed. In self-monitoring, desired behaviors often increase, while undesired ones decrease.

Psychological Testing

  • Projective Testing: Based on psychoanalytic theory; presents ambiguous stimuli to uncover unconscious thoughts.
    • Rorschach Inkblot Test: Uses 1010 inkblot cards. John Exner developed the Comprehensive System to standardize scoring, but it remains controversial.
    • Thematic Apperception Test (TAT): Uses 3131 cards (3030 pictures, 11 blank); patients tell stories. Often used as an icebreaker.
  • Personality Inventories: Rely on an empirical approach rather than theory.
    • Minnesota Multiphasic Personality Inventory (MMPI): The most widely used version (MMPI-22) contains 567567 items answered True/False.
    • Includes Validity Scales to detect response bias (e.g., Lie Scale, Infrequency Scale, Subtle Defensiveness Scale).
    • Includes Clinical Scales for hypochondriasis, depression, hysteria, psychopathic deviate, paranoia, etc.
  • Intelligence Testing:
    • Developed by Binet and Simon to identify children needing academic support. Terman revised it as the Stanford-Binet.
    • Intelligence Quotient (IQ) was originally (mental age / chronological age)  \times 100 .
    • Modern IQ uses Deviation IQ: Comparing an individual's performance to the average of same-age peers.
    • Wechsler Scales (WAIS-IV, WISC-V, WPPSI-IV) include verbal and performance scales.

Neuropsychological and Neuroimaging Assessment

  • Neuropsychological Testing: Measures brain dysfunction through task performance (language, memory, motor skills).
    • Bender Visual–Motor Gestalt Test: Simple screening where children copy shapes.
    • Halstead–Reitan/Luria–Nebraska: Sophisticated batteries; include the Rhythm Test, Strength of Grip Test, and Tactile Performance Test. They are approximately 80%80\% accurate.
    • Result Risks: False Positive (shows a problem when none exists) and False Negative (misses a real problem).
  • Neuroimaging:
    • Structural Imaging:
      • Computerized Axial Tomography (CT/CAT): Uses X-rays in slices (1515 minutes); risk of radiation.
      • Magnetic Resonance Imaging (MRI): Uses magnetic fields and radio-frequency; higher resolution and no radiation, but more expensive and difficult for claustrophobic patients.
    • Functional Imaging:
      • Positron Emission Tomography (PET): Uses radioactive tracers to track blood/oxygen/glucose. Expensive (66 million to establish facility, 500,000500,000 annual operating cost).
      • Single Photon Emission Computed Tomography (SPECT): Less accurate but less expensive and more accessible than PET.
      • Functional MRI (fMRI): Tracks immediate changes in milliseconds; has largely replaced PET. BOLD-fMRI measures blood-oxygen-level-dependent signals.
  • Major Brain Projects: The Human Connectome Project (mapping brain circuits) and the ENIGMA Consortium (1,4001,400 researchers in 4343 countries combining genetics and imaging).

Psychophysiological Assessment

  • Psychophysiology: Measurable changes in the nervous system reflecting emotional/psychological events.
  • Electroencephalogram (EEG): Measures brain's electrical activity (brain waves).
    • Alpha Waves: Regular voltage associated with relaxation and calmness.
    • Delta Waves: Slower, irregular waves occurring during deep sleep. Panic attacks in sleep usually occur during delta-wave sleep.
  • Event-Related Potentials (ERP): Brief EEG changes in response to specific stimuli.
  • Peripheral Measures:
    • Electrodermal Responding (formerly Galvanic Skin Response/GSR): Measures sweat-gland activity controlled by the sympathetic nervous system.
    • Heart rate, respiration, and sexual arousal (penile circumference or vaginal blood flow).
  • Biofeedback: Providing real-time physiological data (muscle tension, heart rate) to help patients learn to regulate automatic responses.

Classification and the History of Diagnosis

  • Idiographic Strategy: Focusing on what is unique about an individual (personality, culture).
  • Nomothetic Strategy: Focusing on identifying the general category/disorder a person matches.
  • Science of Classification:
    • Taxonomy: Scientific classification.
    • Nosology: Classification applied to medical/clinical phenomena.
    • Nomenclature: Labels/names within the nosology (e.g., "Anxiety Disorders").
  • Categorical vs. Dimensional Approaches:
    • Classical (Pure) Categorical: Every disorder has one clear cause and is distinct (Emil Kraepelin's view).
    • Dimensional Approach: Symptoms measured on a continuum (e.g., anxiety rated 11 to 1010).
    • Prototypical Approach: Used by DSM-55; defines essential features but allows for variation in less essential ones. People can have different symptoms yet get the same diagnosis.
  • Historical Highlights:
    • Emil Kraepelin (19131913): Identified dementia praecox (schizophrenia) and manic depressive psychosis (bipolar).
    • DSM-III (19801980): Introduced an atheoretical approach and specific diagnostic criteria, moving phobias from "neurosis" to "anxiety disorders."

Modern Diagnostic Systems: DSM-5 and DSM-5-TR

  • DSM-55 (20132013) and DSM-55-TR (20222022) use Arabic numerals for easier future updates.
  • Section Structure:
    • Section I: Introduction.
    • Section II: Diagnostic Criteria.
    • Section III: Conditions for Further Study.
  • Major Principles:
    • Severity Ratings: Dimensional assessments added to categorical diagnoses to track intensity/frequency.
    • Functional Impairment: Symptoms must cause clinically significant distress or impairment to be diagnosed. Subthreshold symptoms do not qualify.
    • Cultural Formulation: Considering the person's values and beliefs through the Cultural Formulation Interview (CFI). Includes awareness of cultural syndromes like ataques de nervios.
  • Challenges:
    • Comorbidity: Presence of two or more disorders in one person.
    • Reification: Treating diagnostic categories as concrete objects rather than useful tools.
    • Stigma: Negative stereotypes and discrimination. Terms like "idiot" or "mental retardation" became stigmatized; the current term is Intellectual Disability.

Evolution of Specific Diagnoses

  • Homosexuality: Removed from the DSM in 19731973 due to changing social attitudes and scientific evidence (influenced by figures like Harvey Milk).
  • Gender Dysphoria: Focuses on the distress caused by gender incongruence rather than being transgender itself.
  • Disruptive Mood Regulation Disorder (DMDD): Created for children with frequent anger/irritability to avoid over-diagnosing pediatric bipolar disorder.
  • Premenstrual Dysphoric Disorder (PMDD):
    • Started as Late Luteal Phase Dysphoric Disorder (LLPDD) in the DSM-III-R appendix (19871987).
    • Controversial due to fears of pathologizing normal experiences and gender bias (similarities to outdated notions of "hysteria").
    • Research showed only 2%2\% to 5%5\% of women had disabling symptoms compared to 20%20\% to 40%40\% having mild PMS.
    • Eventually included in DSM-55 as an official mood disorder after thousands of peer-reviewed studies.

Future Directions: Spectra and Neuroscience

  • Many researchers advocate for a spectrum approach, grouping related disorders sharing underlying features (e.g., Schizophrenia Spectrum).
  • Negative Affect: A general tendency to experience unpleasant emotions; may be the common foundation for both anxiety and mood disorders.
  • Personality disorders may be extreme versions of normal traits (e.g., extreme shyness/inhibition) rather than separate diseases.
  • Neuroscience: Moving away from the expectation that specific genes match DSM categories. Investigating broad processes like behavioral inhibition that appear across multiple diagnoses.